A Manhattan octaganerian claims he’s been left with “serious visual impairment” as a result of taking Viagra, the erectile-dysfunction drug with sales of $2 billion a year.

It’s done just the opposite for 86-year-old Anthony Andresakis, an Upper West Sider with amorous ambitions, who went to Manhattan federal court, acting as his own lawyer, to ask a judge to shut down sales of the wonder drug.

The “visual impairment has taken away the joy of life,” Andresakis claims in court papers. “Since taking the drug in April 2012, I have had constant, serious visual impairment up to this date.”

Andresakis, who doesn’t give any details about his visual woes, said he was afraid taking Viagra might harm his eyesight, but was assured by the manufacturer, Pfizer, that any impairment would clear up in a few days, he alleges.

Reported side effects can include blurry or blue-tinged vision.

“I have asked Pfizer for help, but have not been given any relief,” Andresakis alleged.

“I would like to have the court order Pfizer to stop selling the drug.”